package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 订单接口业务层
 */
@Slf4j
@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper ;
    @Autowired
    private AddressBookMapper addressBookMapper ;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper ;
    @Autowired
    private OrderDetailMapper orderDetailMapper ;
    @Autowired
    private UserMapper userMapper ;
    @Autowired
    private WeChatPayUtil weChatPayUtil ;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //1. 处理各种业务异常（地址簿为空、购物车数据为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //检查用户的收货地址是否超出配送范围
        //checkOutOfRange(addressBook.getCityName() + addressBook.getDistrictName() + addressBook.getDetail());

        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();

        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList == null || shoppingCartList.size() == 0){
            //抛出业务异常
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //2. 向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setAddress(addressBook.getDetail());
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        //3. 向订单明细表插入n条数据
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();//订单明细
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());//设置当前订单明细关联的订单id
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        //4. 清空当前用户的购物车数据
        shoppingCartMapper.deleteByUserId(userId);

        //5. 封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {

        this.paySuccess(ordersPaymentDTO.getOrderNumber());

        /*
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
         */
        return null;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过 webSocket 向商家推送消息 type orderId content
        Map map = new HashMap<>() ;
        map.put("type", 1); //1 表示来单提醒 2 表示客户催单
        map.put("orderId", ordersDB.getId()) ;  //订单 id
        map.put("content", "订单号：" + ordersDB.getNumber());

        String jsonString = JSON.toJSONString(map);
        log.info("向商家推送来单提醒消息...{}" , jsonString);
        webSocketServer.sendToAllClient(jsonString);
    }

    /**
     * 查询历史订单
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQueryForUser(Integer pageNum, Integer pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();// 订单id

                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 取消订单
     *
     * @param id
     */
    @Override
    public void userCancelById(Long id) throws Exception {
        //根据id查询订单
        Orders orders = orderMapper.getById(id) ;

        //判断订单是否存在
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND) ;
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        //判断下订单的状态 如果已接单的话就不能退款
        if (orders.getStatus() >= 3 ) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR) ;
        }

        //如果当前订单状态是已付款(待接单)的话 那么还要退款
        /*
        if (orders.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    orders.getNumber(), //商户订单号
                    orders.getNumber(), //商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01));//原订单金额

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }
         */

        //修改订单信息 状态 付款状态 取消时间 取消原因
        orders.setStatus(Orders.CANCELLED); //已取消
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orders.setPayStatus(Orders.REFUND); //已退款

        orderMapper.update(orders);
    }

    /**
     * 查询订单详情
     *
     * @param orderId
     * @return
     */
    @Override
    public OrderVO getOrderDetailById(Long orderId) {
        //查询订单数据
        Orders orders = orderMapper.getById(orderId);

        //根据订单id查询套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);

        //封装成VO并返回
        OrderVO orderVO = new OrderVO() ;
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO ;
    }

    /**
     * 再来一单
     *
     * @param id
     */
    @Override
    public void repetition(Long id) {
        //查询当前用户的id
        Long userId = BaseContext.getCurrentId();
        //根据传过来的订单号查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //将订单详情数据转换为购物车数据
        List<ShoppingCart> shoppingCartList = new ArrayList<>() ;
        orderDetailList.forEach(orderDetail -> {
            ShoppingCart shoppingCart = new ShoppingCart() ;
            BeanUtils.copyProperties(orderDetail,shoppingCart);
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartList.add(shoppingCart) ;
        });

        //将购物车数据批量插入到购物车表中
        shoppingCartMapper.insertBatch(shoppingCartList) ;
    }

    /**
     * 订单搜索
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage() , ordersPageQueryDTO.getPageSize()) ; //设置分页查询初始参数
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO) ;

        //部分订单需要额外返回订单的菜品信息 封装成VO对象
        PageResult pageResult = new PageResult(page.getTotal() , getOrderVOList(page)) ;
        return pageResult ;
    }

    /**
     * 根据page参数查询订单中的菜品信息
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        List<OrderVO> orderVOList = new ArrayList<>() ;

        //获取查询回来的订单数据
        List<Orders> ordersList = page.getResult();

        ordersList.forEach(orders -> {
            OrderVO orderVO = new OrderVO() ;
            BeanUtils.copyProperties(orders,orderVO);
            String orderDishes = getOrderDishesStr(orders) ;

            //将订单的菜品信息封装
            orderVO.setOrderDishes(orderDishes);
            orderVOList.add(orderVO) ;
        });

        return orderVOList ;
    }

    /**
     * 获取订单菜品信息
     * @param orders
     * @return
     */
    public String getOrderDishesStr(Orders orders) {
        //根据订单id查询订单详情数据
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将信息拼接成字符串
        List<String> list = new ArrayList<>() ;
        orderDetailList.forEach(orderDetail -> {
            String str = new String() ;
            str = orderDetail.getName() + "*" + orderDetail.getNumber() + ";";
            list.add(str) ;
        });

        String str = String.join("", list) ;
        return str ;    //返回详情信息字符串
    }

    /**
     * 取消订单
     */
    @Override
    public void cancel(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        //根据 id 查询订单
        Orders orders = orderMapper.getById(ordersRejectionDTO.getId()) ;

        //获取订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        Integer status = orders.getStatus() ;
        if (status >= 3 ) {
            //此时已经不能退款了
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR) ;
        }
        /*
        if (status == 1) {
            //状态为已支付但为出餐 需要进行退款
            String refund = weChatPayUtil.refund(
                    orders.getNumber(),
                    orders.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }
         */

        //修改订单状态
        orders.setStatus(Orders.CANCELLED); //已取消
        orders.setCancelTime(LocalDateTime.now());
        orders.setCancelReason(ordersRejectionDTO.getRejectionReason());
        orders.setPayStatus(Orders.REFUND); //已退款

        orderMapper.update(orders);
    }

    /**
     * 订单状态统计
     *
     * @return
     */
    @Override
    public OrderStatisticsVO statistic() {
        //统计各个状态的订单的数量 2 待付款 3 待接单 4 派送中
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        //封装响应结果
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO() ;
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO ;
    }

    /**
     * 获取订单详情
     *
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        //根据id获取订单相关信息
        Orders order =  orderMapper.getById(id);

        //根据订单id获取订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(order,orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    /**
     * 修改订单状态为完成
     *
     * @param id
     */
    @Override
    public void cpmplete(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        //查看订单是否存在或者不在派送中 并设置状态为 4
        if (orders == null || !orders.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR) ;
        }

        Orders order = new Orders() ;
        order.setId(id);

        //设置状态
        order.setStatus(Orders.COMPLETED);
        order.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(order);
    }

    /**
     * 商家接单
     *
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     *
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());

        // 订单只有存在且状态为2（待接单）才可以拒单
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        /*
        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == Orders.PAID) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }
         */

        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }

    /**
     * 客户催单
     *
     * @param id
     */
    @Override
    public void reminder(Long id) {
        //根据订单号查询订单
        Orders orders = orderMapper.getById(id);
        if (orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND) ;
        }

        //使用WebSocket推送催单消息
        Map map = new HashMap() ;
        map.put("type",2) ;
        map.put("orderId",orders.getId()) ;
        map.put("content","订单号：" + orders.getNumber()) ;
        String jsonString = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(jsonString);
    }


}
